Now that we're caching request->ev, ensure it's updated and/or

	Now that we're caching request->ev, ensure it's updated and/or
	NULL'd when we run an event, delete an event, or insert a new
	event.

	Also put a macro around the calls to inserting events in event.c,
	so that changes to the API can be done more easily.  It also makes
	the code easier to understand, too